A few classes/open gyms around Detroit, MI.
Adult class at Downriver Gymnastics in Wyandotte, MI. 8-9PM Tuesday. They also allow adults at their open gyms/open tumbling, see the website for times: downrivergymnastics.com
Adult class at Tatiana Gutsu Gymnastics Academy in Farmington Hills, MI. 8:30-9:30PM Monday. See website: tatianagutsugymnasticsacademy.com
Open gym at Gymnastic Dreams in Livonia, MI. Adults can go to any open gym, see website for details: gymnasticdreams.com